King and Queen always have been in the same leauge. We Sanji stands just wanted King because of these reasons:
- King vs Sanji would have been more cool look-wise, flight, fire, kicks.
- Zoro fans usually downplay characters who look goofy, in fact they're already saying shit like Mingo > Queen when Jack destroys Mingo, Zoro stands also think all the baddass characters are strong for some reason.
- Zoro fans would have accepted the fact that Sanji isn't far at all from Zoro, now when Lolonoa Will fight King they'll start yelling "Zoro had broke Bones, King >>> Queen".